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首页> 外文期刊>The Journal of Chemical Physics >HYDRATION PRESSURE INDUCED BY SOLID SURFACE DISSOLUTION IN ION ADSORPTION FROM AQUEOUS MEDIA - ROLE OF STRUCTURAL FORCE IN PROTON/OXYDRYLE ISOTHERMS OF ALPHA-TRICALCIUM PHOSPHATE WATER SYSTEMS
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HYDRATION PRESSURE INDUCED BY SOLID SURFACE DISSOLUTION IN ION ADSORPTION FROM AQUEOUS MEDIA - ROLE OF STRUCTURAL FORCE IN PROTON/OXYDRYLE ISOTHERMS OF ALPHA-TRICALCIUM PHOSPHATE WATER SYSTEMS

机译：固体表面溶解在离子对水介质的吸附中引起的水合压力-结构力在磷酸钙-磷酸钙水系统的质子/羟基等温线中的作用

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By experimental titration measurements - which were conducted on alpha-Ca-3(PO4)(2)/H2O (1) dispersions to follow H+/OH- adsorption from aqueous solution onto the solid surface - an unexpected shape transition (S-->L, in the Giles classification) was observed in the adsorption isotherm when the solid mass concentration reached the (critical) value c(Nc)=0.54+/-0.01. This phenomenon did not occur when acid/basic aqueous solutions containing Ca2+ and PO43- ions were employed as titrants. Formulation and application of an Ising-based model suggested that solid solubility phenomena can influence the adsorption mechanism by inducing an additional (inhomogeneous) hydration pressure, which seems to be related to interfacial order perturbations produced by the surface dissolution, In the end, the predicted critical solid mass concentration was <(c(Nc))over tilde>=0.53+/-0.01 and, correspondingly, extrapolated values from the model of water correlation length were in agreement with the current literature concerning TCP (tricalcium phosphate) wettability and inhomogeneous structural forces. (C) 1997 American Institute of Physics. [References: 47]
机译：通过实验滴定测量-在α-Ca-3（PO4）（2）/ H2O（1）分散液上进行，以追踪H + / OH-从水溶液到固体表面的吸附-意外的形状转变（S->当固体质量浓度达到（临界）值c（Nc）= 0.54 +/- 0.01时，在吸附等温线中观察到了Gilles分类中的L）。当使用含Ca2 +和PO43-离子的酸/碱水溶液作为滴定剂时，不会发生这种现象。基于伊辛模型的建立和应用表明，固溶现象会通过诱导额外的（不均匀的）水合压力来影响吸附机理，这似乎与表面溶解所产生的界面有序扰动有关。临界固体质量浓度<（c（Nc））超过波浪号> = 0.53 +/- 0.01，相应地，水相关长度模型的外推值与有关TCP（磷酸三钙）润湿性和不均匀性的现有文献一致结构力。 （C）1997美国物理研究所。 [参考：47]

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